It adds two options to standby mode. The user can select to quit the frontend, to run a command that could shutdown the machine (or anything else), or enter the standby screen. These options are selectable in the general settings screen.

This way the idle timer can be set to a shorter timeout and shutdown the fronted immediately instead of having to wait for the backend to shutdown. It's ideal for frontend-only machines.

Rather than creating new settings for this functionality, I'll add a new pair of system events for entering/exiting standby, that will be more flexible without adding more clutter to the setting screens.